While we would all like to get sucked into manufacturers white papers the reality is aero wheels will make you faster but within that reality is a handful of seconds saved. To the average person the savings is meaningless. To the serious competitor or someone that earns a paycheck racing their bike its everything.
Most models and drag tests show differences in the order of minutes. Flo's recent light vs. aero test comes to mind- their 2000g wheelset saves minutes over a very hilly course. In reality the weight argument was overhyped years ago before they had decent aero rim profiles and rims were a lot slower than they are now.
Contador was on 303s at Tirreno.
Flo's areo vs weight article was not a test, and was not test data. It was a computer simulation.
When the pros start using 808s and disks on mountain stages I'll be more inclined to accept Flo's assertions.